Lathe-tool and holder.



Pateted Nov. 26, mol."

c. .lAc

LATHE TOOL L (Applicatio me r. 1, 19

(No Model.)

Y atroz-M43 i UNITED STATES PATENT CEEICE.

CALVIN JACKSON, OF READING, PENNSYLVANIA.

LATHE-TOOL AND HOLDER.

srEcrFIcA'rIoN forming part of Letters Patent No. 687,237, datedNovember 26, 1901 Application tiled March 1, 1900. Serial No. 6,937. (Nomodel.)

To all whom t matt/concern- Be it known that I, CALVIN JACKSON, acitizen of the United States of America, and a resident of Reading, inthe count-y of Berks and State of Pennsylvania, have invented certainnew and useful Improvements in Lathe- Tools and Holders, of which thefollowing is a specification.

My invention relates more particularly to lathe-tool holders andcutters; and my object is to provide asimple, inexpensive, andeasilymaintained form of cutter-tool in connection with a holder, andclamping means adapted to permit the ready adjustment of the cutter tosuit various conditions and the easy and convenient fastening orloosening of the same.

The invention is fully described in connection with the accompanyingdrawings, and the novel features are pointed out in the claims.

Figure lis a side elevation, partlyin section, of my complete deviceinpreferred form, the clamping-wedge being shown loosely in position. Fig.2 is a plan view of the stock alone. Fig. 3 is an end View lookingin thedirection of the arrow, and Fig. 4 is a similar view showing the cutteradjusted rotatively from Figs. l and 3 position.

A represents a holder or stock, which is out from a rolled vbar of steelof rectangular section, the parting cut beingat such an angle as to formparallel end faces ots` and a5, the former of which provides properclearance below the cutter. The upper corner of the outer end is cutaway to a much greater angle, forming an inclined face a2, thusproviding ample clearance for the chips and place for fastening andloosening the cutting-tool. Through this face of* opens a roundreceiving-hole a for this tool, said hole being drilled rearward with adownward incline, as shown. Its inclined lower wall about meets theintersection ofthe oppositely-inclined end faces a2 0,3, and a reducedextension of it (marked ct') opens through the bottom of the stock, soas to permit of access from the rear.

The cutter B is designed to be made by simply cutting off from a rolledbar of toolsteel, which may be readily produced, a proper length for acutter and then grinding the end b to the desired shape. Its half-roundcross section is adapted to loosely iit the round receiving-hole a ofthe stock. In order to adjustably secure it in the latter, a similarhalf-round filling-piece C is employed,

thus occupying the hole as fully as though r b the cutter were made outof a roundbar, but avoiding the expensive and troublesome grinding whichthe latter form would necessitate, while at the same time making itpossible to fasten and release the cutter far more conveniently andsatisfactorily than is pracl ticable with a solid round cutter, as willclearly appear from the preferred means shown in the drawings.

-Insteadofemployingoneormore set-screws j engaging a screw-threaded holeor holes inenabled to employ with advantage a wedgen piece E between thehalf-round cutter and filling-piece. For this purpose I taper theforward end of the filling-piece so as to provide an inclined face c',preferably terminating in the normal dat face c some distance forward ofthe rear end of the iilling-piece, so that the latter when inserted inthe hole a with the cutter B will be positively held up at the front endso as to conveniently admit the wedge-piece E. In adjusting the cuttereither longitudinally or by turning it for right or left hand use, asindicated in Fig. 4, the wedge is withdrawn. When adjusted, it is forcedinto place,thus spreading the parts and firmly clamping the cutter. Whenit is desired to loosen the latter, it may be accomplished as heretoforein similar devices by means of the previously-mentioned extension o. ofthe hole a through the base of the stock, which permits of access to therear end of the cutter. To provide for accomplishing this result moreconveniently and satisfactorily, however, I provide a movable stop forthe rear end of the filling-piece C, against'w'hich it may bear whilethe wedge E is forcedinto place, but which will permit an inwardmovement of the lling-piece for the purpose of releasing the wedge whendesired. This movable stop is preferably made in thelform of a yieldingspring I), which bears against the square bottom a4 of the hole a abovethe reduced bottom passage o and which when the cutter is fastened bythe forcing in of the IOO wedge will normally tend to press thefillingpiece C outward, and thus make the fastening more secure. Whenitis desired to loosen the cutter, however, a moderate tap upon theouter end c2 of the filling-piece will cause the spring-stop D to yieldand permit a momentary inward movement tending to release the wedge E,followed by a quick return tending to carry the loosened wedge outward.Two orthree such taps will serve to entirely loosen the parts so as topermit their free removal or readjustment.

The round receiving-hole for the cutter is not only easily formed bydrilling, but it may also be of a size little less than the thickness ofthe stockA without objectionably weakening the latter, the side wallsbeing of minimum thickness onlyl in the transverse axial plane of thehole. It also permits the use of a wide-faced cutter B capable of rotaryadjustment, whereby an extended cutting edge may be brought into serviceand the necessity for separate right and left shapes is dispensed with.The economy of first cost and maintenance is important as is also theconvenience in fastening andlooseningthe cutter.

What I claim isl. The combination with a tool holder or stock having aplain cylindrical receivinghole, of a cutter of half-round cross-sectionfitting said hole, and clamping means located entirely in saidcylindrical hole between the wall thereof and the flat face ot' saidhalfround cutter for adjustably securing said cutter in thereceiving-hole.

2. The combination with a tool holder or stock having a cylindricalreceiving-hole, of a cutter of half-round cross-section fitting saidhole, and clamping means comprising a separate filling-piece and a wedging device located entirely in said cylindrical hole between the wallthereof and the fiat face of said halfround cutter for adj ustablysecuring said cutter in the receiving-hole.

3. The combination with a tool holder or stock having a cylindricalreceiving-hole, of a cutter of half-round cross-section fitting saidhole, a separate filling-piece of similar crosssection but taperedtoward one end, and a wedge-piece fitted between said taperedfilling-piece and the cutter and adapted to secure the latter inadjusted position.

4. The combination with a tool holder or stock having a cylindricalreceiving-hole, of a cutter of half-round cross-section fitting saidhole, a separate filling-piece of similar crosssection having theforward portion only thereof tapered toward the outer end, and aWedgepiece fitted between said tapered filling-piece and the cutter andadapted to secure the latter in adjusted position.

5. The combination with a tool holder or stock having a cylindricalreceivinghole, of a cutter of half-round cross-section fitting saidhole, a separate filling-piece of similar crosssection but taperedtoward the outer end, a wedge-piece fitted between said taperedfilling-piece and the cutter, and a movable stop in said hole for theinner end of said tapered filling-piece.

6. The combination with a tool holder or stock having a cylindricalreceiving-hole, of a cutter of half-round cross-section fitting saidhole, a separate filling-piece of similar crosssection but taperedtoward the outer end, a Wedge-piece fitted between said taperedfilling-piece and the cutter and a spring-stop for the inner end of saidtapered filling-piece.

Signed by me at Reading, Pennsylvania, this 26th day of February, 1900.

CALVIN JACKSON.

Witnesses:

W. G. STEWART, CAMERON E. SrRAUss.

